public static async Task<ViewModelBase> Next(LinkViewModel parentLink, ViewModelBase currentActual)
{
if (parentLink != null)
{
var viewModelContextService = ServiceLocator.Current.GetInstance<IViewModelContextService>();
var firstRedditViewModel = viewModelContextService.ContextStack.FirstOrDefault(context => context is RedditViewModel) as RedditViewModel;
if (firstRedditViewModel != null)
{
RepositionContextScroll(parentLink);
var imagesService = ServiceLocator.Current.GetInstance<IImagesService>();
var offlineService = ServiceLocator.Current.GetInstance<IOfflineService>();
var settingsService = ServiceLocator.Current.GetInstance<ISettingsService>();
ViewModelBase stackNext = null;
if (settingsService.OnlyFlipViewUnread && (stackNext = LinkHistory.Forward()) != null)
{
return stackNext;
}
else
{
var currentLinkPos = firstRedditViewModel.Links.IndexOf(parentLink);
var linksEnumerator = new NeverEndingRedditView(firstRedditViewModel, currentLinkPos, true);
var result = await MakeContextedTuple(imagesService, offlineService, settingsService, linksEnumerator);
LinkHistory.Push(currentActual);
return result;
}
}
}
return null;
}
public static async Task<ViewModelBase> Previous(LinkViewModel parentLink, ViewModelBase currentActual)
{
if (parentLink != null)
{
var viewModelContextService = ServiceLocator.Current.GetInstance<IViewModelContextService>();
var firstRedditViewModel = viewModelContextService.ContextStack.FirstOrDefault(context => context is RedditViewModel) as RedditViewModel;
if (firstRedditViewModel != null)
{
RepositionContextScroll(parentLink);
var imagesService = ServiceLocator.Current.GetInstance<IImagesService>();
var offlineService = ServiceLocator.Current.GetInstance<IOfflineService>();
var settingsService = ServiceLocator.Current.GetInstance<ISettingsService>();
//need to go backwards in time, not paying attention to the unread rules
ViewModelBase stackPrevious = null;
var emptyForward = LinkHistory.EmptyForward;
if (settingsService.OnlyFlipViewUnread && (stackPrevious = LinkHistory.Backward()) != null)
{
if (emptyForward)
LinkHistory.Push(currentActual);
return stackPrevious;
}
else
{
var currentLinkPos = firstRedditViewModel.Links.IndexOf(parentLink);
var linksEnumerator = new NeverEndingRedditView(firstRedditViewModel, currentLinkPos, false);
return await MakeContextedTuple(imagesService, offlineService, settingsService, linksEnumerator);
}
}
}
return null;
}
private static async Task<ViewModelBase> MakeContextedTuple(IImagesService imagesService, IOfflineService offlineService, ISettingsService settingsService, NeverEndingRedditView linksEnumerator)
{
ViewModelBase vm;
while ((vm = await linksEnumerator.Next()) != null)
{
if (vm is LinkViewModel && imagesService.MightHaveImagesFromUrl(((LinkViewModel)vm).Url) && (!settingsService.OnlyFlipViewUnread || !offlineService.HasHistory(((LinkViewModel)vm).Url)))
{
var targetViewModel = vm as LinkViewModel;
var smartOfflineService = ServiceLocator.Current.GetInstance<ISmartOfflineService>();
smartOfflineService.NavigatedToOfflineableThing(targetViewModel.LinkThing, false);
Messenger.Default.Send<LoadingMessage>(new LoadingMessage { Loading = true });
await ServiceLocator.Current.GetInstance<IOfflineService>().StoreHistory(targetViewModel.Url);
var imageResults = await ServiceLocator.Current.GetInstance<IImagesService>().GetImagesFromUrl(targetViewModel.LinkThing == null ? "" : targetViewModel.LinkThing.Data.Title, targetViewModel.Url);
Messenger.Default.Send<LoadingMessage>(new LoadingMessage { Loading = false });
if (imageResults != null && imageResults.Count() > 0)
{
var imageTuple = new Tuple<string, IEnumerable<Tuple<string, string>>, string>(targetViewModel.LinkThing != null ? targetViewModel.LinkThing.Data.Title : "", imageResults, targetViewModel.LinkThing != null ? targetViewModel.LinkThing.Data.Id : "");
Messenger.Default.Send<LongNavigationMessage>(new LongNavigationMessage { Finished = true, TargetUrl = targetViewModel.Url });
return new LinkedPictureViewModel
{
LinkTitle = imageTuple.Item1.Replace("&", "&").Replace("<", "<").Replace(">", ">").Replace(""", "\"").Replace("'", "'").Trim(),
LinkId = imageTuple.Item3,
Pictures = imageTuple.Item2.Select(tpl => new LinkedPictureViewModel.LinkedPicture
{
Title = tpl.Item1.Replace("&", "&").Replace("<", "<").Replace(">", ">").Replace(""", "\"").Replace("'", "'").Trim(),
ImageSource = tpl.Item2,
Url = tpl.Item2
})
};
}
}
else if (vm is LinkViewModel && LinkGlyphUtility.GetLinkGlyph(vm) == LinkGlyphUtility.WebGlyph && !settingsService.OnlyFlipViewImages && settingsService.ApplyReadabliltyToLinks && (!settingsService.OnlyFlipViewUnread || !offlineService.HasHistory(((LinkViewModel)vm).Url)))
{
var targetViewModel = vm as LinkViewModel;
var smartOfflineService = ServiceLocator.Current.GetInstance<ISmartOfflineService>();
smartOfflineService.NavigatedToOfflineableThing(targetViewModel.LinkThing, true);
await ServiceLocator.Current.GetInstance<IOfflineService>().StoreHistory(targetViewModel.Url);
var result = await ReadableArticleViewModel.LoadAtLeastOne(ServiceLocator.Current.GetInstance<ISimpleHttpService>(), targetViewModel.Url, targetViewModel.LinkThing.Data.Id);
result.WasStreamed = true;
result.ContentIsFocused = false;
return result;
}
else if (vm is LinkViewModel && ((LinkViewModel)vm).IsSelfPost && !settingsService.OnlyFlipViewImages && (!settingsService.OnlyFlipViewUnread || !offlineService.HasHistory(((LinkViewModel)vm).Url)))
{
var targetViewModel = vm as LinkViewModel;
var smartOfflineService = ServiceLocator.Current.GetInstance<ISmartOfflineService>();
smartOfflineService.NavigatedToOfflineableThing(targetViewModel.LinkThing, true);
await ServiceLocator.Current.GetInstance<IOfflineService>().StoreHistory(targetViewModel.Url);
return vm;
}
}
return null;
}
